Depends on what kind of hunting you do. For backpacking on 7 day plus trips in snow/rain - yes. If you are happy with your cotton , definitely not.
Yep.
A lot has to do with the climate(s) in which you hunt as well.
I would say that for the hunting I do my First Lite gear is extremely worthwhile. It’s not only super comfortable it’s versatile and stands up to a lot of hard use so I get my money’s worth as well.
Not for everyone but it’s worth it for me.